Identify Assumptions Existing
Identify risky assumptions for a feature idea in an existing product across Value, Usability, Viability, and Feasibility. Uses multi-perspective devil's advocate thinking. Use when stress-testing a feature idea, doing risk assessment, or preparing for assumption mapping.
Install
npx skills add phuryn/pm-skills --skill identify-assumptions-existinggit clone --depth 1 https://github.com/phuryn/pm-skills.git /tmp/pm-skills
mkdir -p ~/.claude/skills
cp -r /tmp/pm-skills/pm-product-discovery/skills/identify-assumptions-existing ~/.claude/skills/identify-assumptions-existingPersonal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.
From the SKILL.md
## Identify Assumptions (Existing Product) Devil's advocate analysis to surface risky assumptions across four risk areas. ### Context You are stress-testing a feature idea for **$ARGUMENTS**. If the user provides files (designs, PRDs, research), read them first. ### Instructions The user will describe their product, objective, market segment, and feature idea. Work through these steps: 1. **Think from three perspectives** about why this feature might fail: - **Product Manager perspective**: Business viability, market fit, strategic alignment - **Designer perspective**: Usability, user experience, adoption barriers - **Engineer perspective**: Technical feasibility, performance, integration challenges 2. **Identify assumptions across four risk areas**: - **Value**: Will it create value for customers? Does it solve a real problem? - **Usability**: Will users figure out how to use it? Is the learning curve acceptable? - **Viability**: Can marketing, sales, finance, and legal support it? - **Feasibility**: Can it be built with existing technology? Are there integration risks? 3. **For each assumption**, note: - What specifically could go wrong - How confident you are (High/Medium/Low) - Suggested way to test it Think step by step. Be thorough but constructive — the goal is to strengthen the idea, not kill it. --- ### Further Reading
Details
- Skill name
identify-assumptions-existing- Repository
- phuryn/pm-skills
- Path
pm-product-discovery/skills/identify-assumptions-existing/SKILL.md- License
- MIT
- Repo updated
- 29 October 2026
FAQ
What does the Identify Assumptions Existing skill do?
Identify risky assumptions for a feature idea in an existing product across Value, Usability, Viability, and Feasibility. Uses multi-perspective devil's advocate thinking. Use when stress-testing a feature idea, doing risk assessment, or preparing for assumption mapping.
How do I install the Identify Assumptions Existing skill?
skills CLI (Claude Code, Cursor, Codex and more): npx skills add phuryn/pm-skills --skill identify-assumptions-existing. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.
Is Identify Assumptions Existing popular?
It lives in phuryn/pm-skills, which has 27,559 GitHub stars and 2,851 forks, and is included in 3 curated skill lists.
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